K3 receiver desensing on CW during contest

[Jim Brown-10]

On Wed, 25 Feb 2009 01:50:18 -0700, Bill W5WVO wrote:

>While all these transmitters except
>Channel 2 have fundamentals well above 54 MHz (I run a DCI bandpass filter to
>keep it out of my preamp), the accumulated grunge from the transmitters'
>perfectly legal low-level spurious emissions and passive mixes are enough to
>render 6 meters unusable for weak-signal work in the direction of the

Yes. Several decades ago, I was on the tech committee that maintained ham
repeaters on 2M, 220, and 440. All VHF and UHF broadcasters in Chicago are
located on two buildings downtown -- Sears and Hancock. Thanks to that grunge,
a 2M receiver was completely useless anywhere near downtown. I did manage to
make a 220 MHz receiver in a 101st floor window at Hancock "sort of" work to
fill in holes caused by shadowing of the main RX. It was shadowed by the
building from the transmitters for Ch 9 and Ch 11.

I suspect that your 6M problem will be greatly improved when your Ch 2 goes
away. I had a Ch 2 to deal with in Chicago too, but they were only running
about 20-30kW ERP. One very large blessing of DTV is that nearly all the low-
band VHF channels are going away (that is, Ch 2-6). The reason is that DTV is
rather susceptible to impulse noise, and impulse noise is much worse at low
VHF than at higher frequencies.

73,

Jim Brown K9YC


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[Jim Brown-10]

On Wed, 25 Feb 2009 21:26:58 +0000, Stephen  Prior wrote:

>I have a DK9SQ 10 metre long 'fishing pole'.

Yes. This is a winner!  Tape a wire to it, and run some radials to
act as a counterpoise. I have a zip-lock bag filled with lengths of
#22 for exactly this purpose. Works great!

73,

Jim K9YC


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[n7ws]

I have a couple of used 40' fiberglass "hot sticks" that a guy was selling locally some time ago.  They're not backpacking light and even as stout as they look, they're pretty limber and need some guying.  The other downside: they're bright yellow except the top section which is day-glow green.


--- On Wed, 2/25/09, Bob Cunnings <[hidden email]> wrote:

> From: Bob Cunnings <[hidden email]>
> Subject: Re: [Elecraft] KX-1 what do you use for an antenna when you're in a place with no trees to throw the vertical up?
> To: [hidden email]
> Date: Wednesday, February 25, 2009, 4:16 PM
> Out here I often operate in the desert, with no trees at all
> for
> antennas or shade! I use a 32 foot telescoping fiberglass
> pole
> (sometimes 2) from The Mast Company to get wire in the air
> nice and
> high, either as horizontal doublets, vees,  or slopers.
>
> http://www.tmastco.com/main/page_products_telescopic_poles.html
>
> Bob NW8L
>
> On Wed, Feb 25, 2009 at 2:04 PM, Garrett, Russ
> <[hidden email]> wrote:
> > I have a camping trip planned and will likely be in a
> few places where
> > there are no trees where I will easily get a vertical
> wire up.  What
> > does everyone else do when the surroundings are not
> ideal for a wire in
> > a tree?  I have seen other antennas referenced such
> as the buddystick
> > and the PAC-12.
> >
> > Thanks
> >
> > Russ Garrett
> > Kd7mpk
> >
> >
> > mail.bullivant.com made the following annotations
> >
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[RussG]

Thanks to all that responded.  The general consensus is that using the
buddistick, pac-12 or some other version of coil and shorter vertical is
not as effective as simply getting up as high as possible with a
vertical wire antenna and radial/counterpoise.  Other than the tree,
most have suggested a telescopic pole made of fiberglass and there are
several on the market.   They will need to be supported with guy lines.
I have used a 28 foot vertical.  The 32 would be ideal I would guess as
the next smallest is 22 ft.  

Thanks again

Russ
Kd7mpk

mail.bullivant.com made the following annotations
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Please be advised that, unless expressly stated otherwise, any U.S. federal tax advice contained in this e-mail, including attachments, is not intended to be used by any person for the purpose of avoiding any penalties that may be imposed by the Internal Revenue Service.
*********************************************************
This e-mail is for the sole use of the intended recipient(s) and contains information belonging to Bullivant Houser Bailey, which is confidential and/or legally privileged.  If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or taking of any action in reliance on the contents of this e-mail information is strictly prohibited.  
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[n7ws]

Unless you're camped on a salt water beach, use that pole to support an inverted vee (which can be part of the guy system).


--- On Wed, 2/25/09, Garrett, Russ <[hidden email]> wrote:

> From: Garrett, Russ <[hidden email]>
> Subject: Re: [Elecraft] KX-1 what do you use for an antenna when you're in a place with no trees to throw the vertical up?
> To: [hidden email]
> Date: Wednesday, February 25, 2009, 7:17 PM
> Thanks to all that responded.  The general consensus is that
> using the
> buddistick, pac-12 or some other version of coil and
> shorter vertical is
> not as effective as simply getting up as high as possible
> with a
> vertical wire antenna and radial/counterpoise.  Other than
> the tree,
> most have suggested a telescopic pole made of fiberglass
> and there are
> several on the market.   They will need to be supported
> with guy lines.
> I have used a 28 foot vertical.  The 32 would be ideal I
> would guess as
> the next smallest is 22 ft.  
>
> Thanks again
>
> Russ
> Kd7mpk

     
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